Design and construction problems of steel sleeve aerogel insulation pipe
The steel sleeve aerogel insulation pipe is pre-made in the factory, but special attention should be paid to the following problems in design and construction:
1. It is necessary to truly understand that the direct laying method of heating pipes is divided into two ways of making up for direct burial and uncompensated direct burial, design and construction. It is true to master the working principle of the two methods, the characteristics of steel sleeve aerogel insulation pipe and its application place, so as to be reasonably selected in design, construction is safe, reliable and economical.
2. Carry out inspections carefully after entering the site. Before the construction, it is necessary to conduct research on the manufacturers of high-temperature steel sleeve aerogel insulation pipes. Refuse to use the unqualified insulation pipe.
3. Welding is a key task to ensure the quality of the project, in the construction of prefabricated direct buried pipelines.
4. Under the conditions of pressure suppression, it is necessary to pay attention to the pressure of the prefabricated straight pipe. First, the water is drained and drained, and then it is done in two steps: no leakage within 10 minutes of voltage regulation. Strength test: After the pressure in the pipeline is raised to 1.5 times of the working pressure; the weld is individually tapped around the weld with a 1kg hammer. The tightness test: when the pressure in the pipe is reduced to the working pressure, no time is 30 minutes. Leakage and pressure drop not exceeding 0.2 atmospheres is acceptable; pressure test records should be prepared according to the specifications.
5. The construction quality of various wells directly affects the quality of the project and the service life of the pipeline, and the fixed bracket. If the well is not well waterproofed, the parts will be damaged by water immersion. Therefore, construction should be carried out carefully to ensure the quality of construction.
6. Must be given enough attention. The steel joint steel aerogel insulation pipe on-site joint insulation must be carried out after the test pressure is qualified, and the on-site joint aerogel insulation construction. This item is the construction quality of the prefabricated direct buried pipeline construction, which directly affects the service life. The aerogel insulation layer has two methods of on-site foaming construction and thermal insulation tile construction. No matter which method is used, there can be no annular space, cracking, delamination and other defects. There are many ways to maintain the layer (such as high density poly Ethylene and FRP protective coatings), but must ensure the integrity, tightness and water resistance of the joint.
7. Joints, backfill should be pressure tested in the pipeline. After the completion of the measurement, the cleaning can be carried out, and the steel sleeve aerogel insulation pipe must be backfilled with the specified thickness of sand according to the characteristics of the prefabricated direct buried pipe construction, and must not cut corners.
8. The steel sleeve aerogel insulation pipe is buried in the ground and the project is accepted. Most of them are concealed projects. If the completion acceptance is not serious, the completion data will not be detailed, which will affect the future use.